I also asked someone for advice from another site and they told me to run Combofix to make sure my machine is free of viruses.

Bad advice. here’s why

http://www.bleepingcomputer.com/combofix/how-to-use-combofix

here’s what the publisher says ( sUBs )
http://www.techsupportforum.com/1829551-post6.html

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Attach here last Combofix.txt log. If you dont have it…

delete your copy of ComboFix and download fresh onefrom here and save it to your Desktop.
If you are unsure how ComboFix works please read this guide carefully.
note: ComboFix must be downloaded to your Desktop.

Temporarily disable your AntiVirus program.
If you are unsure how to do this please read this Instruction.

Run ComboFix.
ComboFix will check if there is a newer version of ComboFix available.
Click Yes if prompted to download.
ComboFix will display DISCLAIMER OF WARRANTY ON SOFTWARE.
Click Yes to allow ComboFix to continue.
If Recovery Console is not installed, ComboFix will offer download & installation.
Click Yes to allow ComboFix to install Recovery Console.

When the tool is finished, it will produce a log report for you. (typical location: C:[b]ComboFix.txt[/b] )
Post log reports ( ComboFix.txt) back to topic.